Your income certainly can.
A new partner's property cannot be placed in the pot, but a court could consider that there would therefore be more money available to provide for the other spouse's accommodation, particularly when children are concerned. Likewise, if a new partner has moved into the ex matrimonial home, then the court would assume that the new partner is contributing to the running expenses of the household. If either of you has plans to remarry, this should also be declared.
http://www.divorceaid.co.uk/financial/family-h ome.htm